differential or incremental backup

jcapc

Hi
I understand how they work, but I don't understand why call differential and incremental. For me should be around


Incremental, backup only that what changed. Restore slow
Select After Backup
X
WHAT WE ARE INCREMENTED ?????????????????



Differential, backup everything since last full backup including what you already backup, that way you leave the Archive bit marked.
Restore fast
Select After Backup
X X
WHY DIFFERENTIAL??????????


X: Archive bit

Extra Note:

Full Backup
Select After Backup
X or blank blank

jcapc

Full Backup

                  Select             Aft Backup
                X or blank              blank

Differential

                  Select             Aft Backup
                      X                      X

Incremental

                  Select             Aft Backup
                      X                    blank
X: bit archive